The wetter the better. From sponge cities in China to ‘berms with benefits’ in New Jersey and floating container classrooms in the slums of Dhaka, we look at a range of projects that treat storm water as a resource rather than a hazard

Evenly spread over all of the world’s mountains, deserts and other terrains, we would be standing 150 metres away from our nearest neighbours. In the most densely populated cities – from Dhaka to Medellin – we’re right on top of them